经过几周的痛苦，我成功了。这是我针对 Android studio 1.3.1、OpenCv 2.4.11 的正确代码。首先你应该这样做Android Studio 中的 OpenCV https://stackoverflow.com/questions/27406303/opencv-in-android-studio（不要使用包含空格的路径，无论是项目还是 opencv 提取文件夹）然后，让 opencv 成为原生：
gradle-wrapper.properties：
distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-all.zip
构建.gradle（应用程序）：
classpath 'com.android.tools.build:gradle-experimental:0.2.0'
构建.gradle（模块）：
apply plugin: 'com.android.model.application'
model {
android {
compileSdkVersion = 23
buildToolsVersion = "23.0.0"
defaultConfig.with {
applicationId = "android.overloaded.nativetestv4"
minSdkVersion.apiLevel = 18
targetSdkVersion.apiLevel = 23
versionCode = 1
versionName = "1.0"
}
}
android.ndk{
moduleName = "mymodule"
ldLibs += ['log']
cppFlags += "-std=c++11"
cppFlags += "-fexceptions"
cppFlags += "-I${file("C:/DevAndroid/OpenCV-android-sdk/sdk/native/jni/include")}".toString()
cppFlags += "-I${file("C:/DevAndroid/OpenCV-android-sdk/sdk/native/jni/include/opencv")}".toString()
// ldFlags += linkOpt
ldLibs += ["android", "EGL", "GLESv2", "dl", "log", "z"]// , "ibopencv_core"
stl = "gnustl_shared"//"gnustl_static"//"gnustl_shared"//"stlport_static"
}
android.buildTypes {
release {
minifyEnabled = false
proguardFiles += file('proguard-rules.pro')
}
}
android.productFlavors {
create("arm") {
ndk.with {
abiFilters += "armeabi"
File curDir = file('./')
curDir = file(curDir.absolutePath)
String libsDir = curDir.absolutePath+"\\src\\main\\jniLibs\\armeabi\\" //"-L" +
ldLibs += libsDir + "libnative_camera_r4.3.0.so"
ldLibs += libsDir + "libopencv_contrib.a"
ldLibs += libsDir + "libopencv_core.a"
ldLibs += libsDir + "libopencv_highgui.a"
ldLibs += libsDir + "libopencv_imgproc.a"
ldLibs += libsDir + "libopencv_info.so"
ldLibs += libsDir + "libopencv_java.so"
ldLibs += libsDir + "libopencv_legacy.a"
ldLibs += libsDir + "libopencv_ml.a"
ldLibs += libsDir + "libopencv_ts.a"
}
}
create("armv7") {
ndk.with {
abiFilters += "armeabi-v7a"
File curDir = file('./')
curDir = file(curDir.absolutePath)
String libsDir = curDir.absolutePath+"\\src\\main\\jniLibs\\armeabi-v7a\\" //"-L" +
ldLibs += libsDir + "libnative_camera_r4.3.0.so"
ldLibs += libsDir + "libopencv_contrib.a"
ldLibs += libsDir + "libopencv_core.a"
ldLibs += libsDir + "libopencv_highgui.a"
ldLibs += libsDir + "libopencv_imgproc.a"
ldLibs += libsDir + "libopencv_info.so"
ldLibs += libsDir + "libopencv_java.so"
ldLibs += libsDir + "libopencv_legacy.a"
ldLibs += libsDir + "libopencv_ml.a"
ldLibs += libsDir + "libopencv_ts.a"
}
}
create("x86") {
ndk.with {
abiFilters += "x86"
}
}
create("mips") {
ndk.with {
abiFilters += "mips"
}
}
create("fat") {
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.0.0'
compile project(':openCVLibrary2411')
}
.cpp
#include <jni.h>
#include <vector>
#include <string>
#include "helpers.h"
#include <opencv2/core/core.hpp>
using namespace std;
#ifdef __cplusplus
extern "C" {
#endif
JNIEXPORT jstring JNICALL
Java_android_overloaded_nativetestv4_MainActivity_FuncV1(JNIEnv *env, jclass type) {
cv::Mat mat(33,22, 1);
string s = "Cpp v1 - succ, rows#:" + Helpers::ToStringNum(mat.rows);
Helpers::Log(s);
return env->NewStringUTF(s.data());
}
}
.java
package android.overloaded.nativetestv4;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
{
static {
System.loadLibrary("mymodule");
}
public static native String FuncV1();
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(this, FuncV1(), Toast.LENGTH_LONG).show();
((TextView)findViewById(R.id.txtInfo)).setText(FuncV1());
}
Android Studio 1.5.1、OpenCV 3.1 更新
1.首先你应该这样做Android Studio 中的 OpenCV https://stackoverflow.com/questions/27406303/opencv-in-android-studio（不要使用包含空格的路径，无论是项目还是opencv提取文件夹），之后你应该有正常工作的Java应用程序
2. 更改项目根目录中的build.gradle：
buildscript {
repositories {
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle-experimental:0.4.0"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
- 更改 gradle-wrapper.properties：
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-all.zip
-
更改opencv模块中的build.gradle：
apply plugin: 'com.android.model.library'
model {
android {
compileSdkVersion = 23
buildToolsVersion = "23.0.2"
defaultConfig.with {
minSdkVersion.apiLevel = 11
targetSdkVersion.apiLevel = 23
}
}
android.buildTypes {
release {
minifyEnabled = false
proguardFiles.add(file("proguard-rules.txt"))
}
}
}
-
更改应用程序模块中的build.gradle：
apply plugin: 'com.android.model.application'
model {
android {
compileSdkVersion = 23
buildToolsVersion = "23.0.2"
defaultConfig.with {
applicationId = "android.overloaded.opencv31v1" //Name of package
minSdkVersion.apiLevel = 11
targetSdkVersion.apiLevel = 23
versionCode = 1
versionName = "1.0"
}
}
android.ndk {
moduleName = "native" // Name of C++ module, for System.loadLibrary("native")
cppFlags.add("-std=c++11") // Add provisions to allow C++11 functionality
cppFlags.add("-fexceptions")
// YOUR OPENCV DIRECTORY!!!
cppFlags.add("-I${file("C:/DevAndroid/OpenCV-android-sdk/sdk/native/jni/include")}".toString())
ldLibs.addAll(["android", "EGL", "GLESv2", "dl", "log", "z"])
stl = "gnustl_shared"
}
android.buildTypes {
release {
minifyEnabled = false
proguardFiles.add(file("proguard-rules.txt"))
}
}
android.productFlavors {
create("arm") {
ndk.with{
abiFilters.add("armeabi")
File curDir = file('./')
curDir = file(curDir.absolutePath)
String libsDir = curDir.absolutePath + "\\src\\main\\jniLibs\\armeabi\\"
ldLibs.add(libsDir + "libopencv_core.a")
ldLibs.add(libsDir + "libopencv_highgui.a")
ldLibs.add(libsDir + "libopencv_imgproc.a")
ldLibs.add(libsDir + "libopencv_java3.so")
ldLibs.add(libsDir + "libopencv_ml.a")
}
}
create("armv7") {
ndk.with {
abiFilters.add("armeabi-v7a")
File curDir = file('./')
curDir = file(curDir.absolutePath)
String libsDir = curDir.absolutePath + "\\src\\main\\jniLibs\\armeabi-v7a\\"
ldLibs.add(libsDir + "libopencv_core.a")
ldLibs.add(libsDir + "libopencv_highgui.a")
ldLibs.add(libsDir + "libopencv_imgproc.a")
ldLibs.add(libsDir + "libopencv_java3.so")
ldLibs.add(libsDir + "libopencv_ml.a")
ldLibs.add(libsDir + "libopencv_ts.a")
}
}
}
android.sources{
main{
jni{
source{
srcDirs += ['src/main/jniMy']
}
}
}
}
}
dependencies {
compile fileTree(dir: "libs", include: [$/*.jar/$])
compile "com.android.support:appcompat-v7:23.1.1" //Do not use 23.2.0
compile project(":openCVLibrary310")
}
创建目录 app/src/main/jniMy，这是您的 .cpp 文件的位置
-
可以选择在 jniMy 中创建文件 chelper.c，代码如下：
#ifndef OPENCV31V1_CHELPER_H
#define OPENCV31V1_CHELPER_H
#include <jni.h>
#include <vector>
#include <string>
#include <sstream>
#include <android/log.h>
using namespace std;
class Helpers{
public:
template <typename T>
static string ToStringNum(T tNumber){
ostringstream ostrStream;
ostrStream << tNumber;
return ostrStream.str();
}
static void Log(string s){
__android_log_print(ANDROID_LOG_INFO, "My", s.data());
}
static void Log(std::exception ee){
string s = "Exception: " + string(ee.what()) ;
__android_log_print(ANDROID_LOG_INFO, "My", s.data());
}
static long Time(){
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
return (long)((int64_t)now.tv_sec * 1000LL + now.tv_nsec /1000000LL);
}
static string Time(long iTime){
return ToStringNum(Time() - iTime) + "ms";
}
};
#endif //OPENCV31V1_CHELPER_H
-
在 jniMy 中创建文件 native_exporter.cpp，代码如下：
#include <jni.h>
#include <string>
#include <opencv2/core/core.hpp>
#include "chelper.h"
extern "C"{
JNIEXPORT jstring JNICALLJava_android_overloaded_opencv31v1_MainActivity_FuncV1(JNIEnv *env,
jclass type) {
cv::Mat mat(33,22, CV_32FC2);
string s = "Cpp v1 - succ, rows#:" +Helpers::ToStringNum(mat.rows);
Helpers::Log(s);
auto i = 5;
for (int i2 : {1,3,5}){
Helpers::Log(Helpers::ToStringNum(i2));
}
return env->NewStringUTF(s.data());
}
}
-
MainActivity.java中的代码：
package android.overloaded.opencv31v1;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.SurfaceView;
import android.widget.TextView;
import android.widget.Toast;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2
{
private static void Log(String sMsg){Log.i("My", "MainActivity." + sMsg );}
static{
System.loadLibrary("opencv_java3");
System.loadLibrary("native");
}
public native String FuncV1();
JavaCameraViewCustom2 _javaCameraView; //Similar to JavaCameraView
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(getSupportActionBar() != null)getSupportActionBar().hide();
String sRes = FuncV1();
Toast.makeText(this, sRes, Toast.LENGTH_LONG).show();
((TextView)findViewById(R.id.txtInfo)).setText(sRes);
_javaCameraView = (JavaCameraViewCustom2)findViewById(R.id.cameraView);
_javaCameraView.setVisibility(SurfaceView.VISIBLE);
_javaCameraView.setCvCameraViewListener(this);
}
@Override
protected void onResume()
{
super.onResume();
_javaCameraView.enableView();
}
@Override
protected void onPause()
{
super.onPause();
_javaCameraView.disableView();
}
Mat _imgBgrTemp;
@Override
public void onCameraViewStarted(int width, int height)
{
_imgBgrTemp = new Mat(height,width, CvType.CV_8UC4);
}
@Override
public void onCameraViewStopped()
{
_imgBgrTemp.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)
{
_imgBgrTemp = inputFrame.rgba();
return _imgBgrTemp;
}
}
Android Studio 会要求你更改 jdk，它也会安装新的 gradle，你应该按照它要求的一切进行操作。
